Vacuum cleaning device.



G J. SHEPPARD & H. F. ADAMS.

VACUUM OLEANING DEVICE. APPLICATION FILED DEO.11, 1908.

UL H B b S m H 1H8 m n ,w D1

L a w y W4 W. fl 7% G. J. SHEPPARDG; 11. F, ADAMS.

VACUUM CLEANING DEVICE. APPLIUATIONIILED DEO.11, 190s.

Patented Sept. 5, 1911 2 urns-5113M 2.

Witnesses WWI": W 1W for mitts OFFICE...

GEORGE JAMES SHEPPARD AND HENRY FEAhTKLIN ADAMS, OF MONTREAL, QUEBEC,

. CANADA. i

Specification of Letters Patent.

; vacuum CLEANING nri'vren.

To ullilfl'z'ofn "it may concern:

Be it known that we, Gnoiion J. Snnrrnnn andrlnxnr F. Aunts, both of the city of Montreal, Province of Quebec, Canada, have invented certa n new and usefullmp'rovements in Vacuum Cleaning Devices andwe do hereby declare that the follow ing a full, clear, andexaet description of the same. i

The invention may be said" to consist of the construction and combination of parts herein described and pointed out the claims. For full comprehension however of our invention reference must be had to the acco'i npanying drawing's forming a part of this specification, in which similar reference characters indicate the same parts and plantfor; householders use, and illustrating I wherein" Flgure 1 sa side elevation of the carrylng frame of a portable vacuum'cleanmg the internal mechanism; Fig. .2 is a front elevation thereof; Fig. 3 isa horizontal sectional view taken on line 3, 3, Fig. 1; 1 illustrates a vacuum pump which forms a part of our inrention; Figs. 5 and 6 are detail plan and sectional views of a valvular member of the pump; Fig. 7 is a detail-sec 'tional view of a' member for affording relief to the vacuum side of thepump. 1

This invention embodies a vacuum pump the exhaust from which utilized as an air blast to meet certain requirements; means for causing the circulation of a lubricant through the parts ofthe pump; pumping mechanism adapted towinaintain a lDYRCU; cally uniform vacuum; and means for preventing an undue suction being exerted upon thepiston at the time the pump is momentarily in a state of; lowest efficiency, such meansrbeing also adapted to act a receptacle-for surplus lubricant.

, 1 designates a wheeled frame having a floor 2 upon which is fixed a motor 80f any preferred type, the shaft whereof drives a train of gears 4 actuating a sprocket wheel 5 over which and a second sprocket wheel 7 is looped an endless chain 6 such second sprocket wheel being secured on a shaft 8 set in bearings 9 on the supporting v frame.

The shaft 8 is provided with th re elcranks 10 each differing in angular position from that next to it by 120 degrees, and a series of vacuum pumps areoperated in succession these cranks, the ob ect;1n so spac ng-the i a pair cranks being to reduce to a minimum the fluctuations 1n the vacuum created All these pumps are alike and each comprises a piston 23 preferably of cylindrical form and inclosing a cylinder 14; fixed to a base 12 secured to the floor 2 oftheframe, such base being provided with a flange 13. The

inner cylinder 14 is located with its lowerend within the flange 13 and its upper end closed as at 15 and formed with a depresslon 16 the function'whereof is to atford--a space. beneath the transverse face of the piston for the purpose of preventing com-" plete displacement of air between the faces 15 and 2 1 of the fixed cylinder or abutment and the cylinder. This depression "also serves as a receptacle for the oil which works its way up between the piston and abutment I under the influence of the vacuum between such faces. i i

I Carried by the closed end of the cylindrical abutment is a valve chamber 17 with its upperend open and having its lower end connecting with a stand pipe 18 which extends ,downwardly' through the casing lt and the floor 2. The valve 19 in this chamber 17 is movably retained in position or guided by means of a stem guide 20. [The base 12 also carries an outer wall 21 forming with the abutment a sealing and lubricating space 22 adapted to containja,

body of oil or other sealing andlubricant for liquid seal. The depth of this seal is such that the rim of the cylindrical'piston dips into it when at its lowermost point andrises Patented'Sept. 5,1911. v

" Application filed December 11, 1938. Serial No. 467,118. 7

clear of it during each stroke thus effec z tively lubricating the contacting cylindrical faces and affording a perfectseal. I The face 24 of the cylindrical P ston is vpresented by a transverse diaphragm, hayji ng a pair of valves the space 26 between this cylinder and t upper closed end 25 of the cylindrical constituting a compressed air the downward stroke of the p ston" nect-ion between the cranks 10 and the p iS-. tons. The compartment 26 is prov1dedw1tha nipple 30 to which is attached a flexible pipe 31 through which an air blast is" do;

28 positioned relatiye'lyto of ports 27 by valve-stem guides fih in the space between 21 and. 25isf expelled way back-to the chamber 22.. The body of" lubricant is, under the vacuum produced slightly vaporized inthe operation of the apparatus. The connection between thepiston and pitman .is effected by a-cylindrica-l 'castin 33, 34, braced between the closed endthe piston and the diaphragm 24 and having an internal hollow boss 35 tapped and ter minating in a concavity 37 affording a seat for a ball 25 man 11. This ball-end is held on its seat by an exte'riorly. screw threaded collar or nut 39 ooncaved to fit the, upper surface of the said'ball,-such collar having depression I '40 to receive a common form of spanner.

The closed end 25 of; the piston is cut away at the circumferential line of the casting 34 to accommodate the action ofthe pit-man. By this construction-the connections between the pit men 11 and pistonsare renderedjprac-v ticallyfrictionless. I

The lower'endsof the pipes 18 are connected by means of ipes 42 beneath the floor 2' and are joine tion 43 one branch of which is conn cted by a pipe 44 to. a .dust collecting box 45 supported in the framel. and from which a flexible pipe leads to the suction iinpIement. 'As the piston area is many timesgreater than the capacity of the three pipes erated successively a continuous vacuum is produced in the dust colleetor box 45.;

A branch 46 extends from the horizontal portion of pipe 44 to relief device for're- .duc1ng the vacuum should it exceed a predetermined degree and then prevent an 9 overload on the motor 3. This device comprises a lower fixed casing 47 provided with a double wall 48 adapted to retain oil or any suitable sealing body 49, and a dome 50 having its lower end working in the space presented by the double wall and sealed by the oil therein; g The dome has-a port 52 controlled by an external valve 53 the stem 54 of which extends down through the port and is fixed in the bottom of casing 47,?while a spring 51 yieldingly supports the dome with'the edge of the port 52 bearing upon the-waive. In the operation of this invention should the intake The uniformity of come the tension of the spring 51 and lower pumping mechanism,

38 upon the lower end of the pitby a 4-way connec--..

' the subjectmatter of a separate application and as the pumps are op-.

'pipe 55, which enters the collector box, become clogged and thevacuum increase to a point where there would be an overload on the motor, such abnormal vacuum will overthe dome 50 away from the valve 53 thus opening the'port 52 and permitting the entrance of air until the vacuum is reduced to the required degree. In the operation of the entire apparatus, the motor 3 being started ower is transmitted to the pumps throng train of gears 4. the sprocket chain 6, the crank shaft, and

I pitmen, and a vacuum is created, through pipes 18; 42, and 44, and coupling 43, in the collector box 45 which exerts a steady suction in the usual dust collecting suction implement (not shown) coupled to 53.

The piston 23 fitting comparatively loosely on the casing 14 and working into the body of oil 22 is practically frictionless and noiseless, thus requiring a minimum of power for its operation. There being three cranks 10 equally spaced apart there is no poundi g of the motor and a constant vacuum is maintained.

The train of gears, sprocket wheels and chain are especially used in this construction owing to the compactness and utility oftheir arrangement.

The action of the pump causes the lubricant to circulate from 22, between the piston and cylindrical abutment, through ports 27, chamber 26, and openings 32 back to 22 again.

While we have described and illustrated means for relieving the vacuum should it exceed a predeterminedmaximum degree We do not herein claim thesame as it forms filed by us on December 11th, 1908 under No. 467117. i

What we claim is as follows 1. In avacuum cleaning appa'ratus,avacu.-

and compression pump comprisinga casing having one end secured to the base and its opposite end closed and having a port therein, a pipe communicating with the port, a one way valve controlling the said port, a cylindrical piston having one end in- 1 closing and in slidable relation with the easing andi'ts opposite end closed, a transverse partition within the cylindrical piston and situated near .the closed end thereof andformin 'therebetween andthe closed end of the cyllndrical piston a compression chamber, such chamber being provided with an outlet, the'said partition having an inlet of greater capacity than the said outlet, and means for reciprocating the cylindrical piston, for the purpose set forth.

2. In avacuum cleaning apparatus 'a vacuum pump, comprising a fixed casing having a port therein, acylindrical p ston 1nclosing' andin slidable relation w th such casing inclosing the port, the cylindrical piston having a chamber therein with an outlet port and the wall of such chamber contiguous to the main body of the casing *ing an int-alto controlled by an auto valve, means for 1. -:('ri1nocatii1g the liutlricai piston liar the pur iiose' oitxezzertuig a suction upon the first mentione il port and ing an intake of greater capacity than the outlet and controlled'by an automatic valve,

' means for reciprocating the cylindrical piston, for the purpose of exerting a suction upon the first mentioned port and accumulating compressed air in the said chamber and means whereby the said suction and compressed, air are utilized.

4-. In a vacuum cleaning apparatus, a vacuum pump comprising a fixed casing having a port therein, a cylindrical piston inclosing and in slidable relation with such casing and inclosing the port, the cylindrical piston having a chamber therein with an outlet port and. the wall of such chamber contiguous to the main body of the casing having an intake controlled by an automatic valve, means for reciprocating the cylindrical piston for the purpose of exerting a suction upon the first mentioned port and accumulating compressed air in the said chamber, means whereby thesaid suction and com- ;sed vair are utilized, and means whereby lubricant automatically circulated between the bearing faces of the pump.

5. In a vacuum cleaning apparatus a vacuum pump comprising a fixed casing having a port therein, a cylindrical piston in ing and in slidable relation with such ng and'inclosing the port, the cylindrical piston having a chamber therein with an outlet port and the wall of such chamber contiguous to the main body of the casing having an intake, of greater capacity than the outlet and cont-rolled by an automatic valve, means for reciprocating the cylindrical piston for the purpose of exerting a $110- tion upon the first mentioned port and ac stimulating compressed air in the said chamber means, whereby the said suction and compressed air are utilized, and means. whereby a}: lubricant is automatically circulated between the bearing faces of thepump I 6. In avacuumcleaning apparatus a vacu um pump comprising a fixed cylindrical abutment having a port and an automatic valve controlling such port; a cylindrical piston mclosing and in slldable relation with such cylindrical abutment; a receptacle for 'e the piston dip therein atone end'of v,t'rolte. V

.n aining a lubricant disposed ina position in in a vacuum cleaning apparatus vac-w,

um pinup comprising a fixedcylindrical bricant disposed in position to have the piston dip therein at one end of its stroke. l

8. In a vacuum cleaner, a pump comprising a double walled casing, a valve chamber setone end of such casing; a valve in the. chamber; a pipe extending from the valve chamber outside of the casing and controlled by the valve, and a cylindrical piston-working between said walls and provided with Valves.

9. In a vacuum cleaner, a double-Walled casing adapted to contain a liquid body he tween its walls, a valve pipe extending through the casing; and a cylindrical piston provided with a valved compartment having an air outlet, such cylindrical piston having its wall located slidably between the walls of the casing.

10.. In a pump, the combination with a casing comprising inner and outer walls presenting between them a chamber for a lubricant and a cylindrical piston inclosing one end of the inner wall and adapted to distribute the lubricant from end to end of the latter, of a receptacle for collecting the lubricantat the inclosed end of the inner wall, such receptacle being in communication with the lubricant chamber.

11. In a vacuum pump the combination with a base 12 and an abutmentcasing A having one end secured to thebase and its opposite end closed and having a port therein and a depression surrounding the latter, a pipe 18 communicating with the port; a valve 19 controlling the port,-'of a wall 31 secured at one end to the base 12 and separated. from and surrounding the abutment casing and adapted to contam a lubricant in the intervening space; a cyhndrical piston 23 closed at one end and provided with an outlet 30 at such closed end and the opposite end'inclosing and being ill slidable relation with the closed end otthe abutment casing and adapted to dlp into the lubricant, a transverse partition 24 within the second mentioned casing near the closed end thereof presenting inlets 27 of greater capacity than the outlet 30, valves 29 controlling'theinlets, the said cylindrical piston having drip ports 32, and means for reciprocating the said cyl ndrical p ston.

12. In vacuum pump the combination a base 12 and an abutment casing 14 having one end secured to the base and its "opposite end closed and having a port therein and a depression surrounding the latter,

a pipe 18 communicating with the port; a

valve 19 controlling the port, of a wall 21 secured at one end to the base 12 and separated from and surrounding the "abutment casing and. adaptedto contain a lubricant in the intervening space; a cylindrical piston 23 closed at one end and provided with e an outlet 30 at such closed end and the'opposite end inclosing and being in slidable relation with the closed end of the abutment casing and adaptedto dip into the lubricant, 15

a transverse partition 24 within the second ment'i0ne d casing, near the closed end thereof presenting inlets 27. of greater capacitythantheoutlet 30, valves 29 controlling the inlets, the: said cylindrical'piston having drip ports 32, and means for reciprocating the said cylindrical piston, including a hollow boss 35 upon the piston and tapped and retaining the ball 38.

witness whereof We have hereunto set our hands in the presence of two witnesses.

GEORGE JAMES. SHEPPARD. HENRY FRANKLIN ADAMS.

- Witnesses:

. P. HARNEY,

E. M; SLINEY. 

